The circle app is awesome (make it more readable ?)

Regarding the gauge question, somewhere in a thread I posted code for drawing a ring. It used the Andres circle algorithm. I have some variations for drawing partial circles (for a gauge) on my computer. It worked wonderfully in the emulator but when I got my hands on the real thing it was too slow, so it is on my to do list to redo in C. I notice that there is already code in Espruino to draw a thick ring (filled annulus) but doesn't seem to be exposed in JavaScript, so that could be a starting point for a different approach, but in current form doesn't deal with the "partial" bit.